Added structured links

[bbollen23]

Does this PR close any open issues?

Closes #91

Give a longer description of what this PR addresses and why it's needed

Adds a structured link component for use in Markdown files with right-hand nav sidebar.

Provide pictures/videos of the behavior before and after these changes (optional)

Usage:
Inside the VegaStimulus.md file, we can add the structured links like this:

import StructuredLinks from '../../src/components/StructuredLinks/StructuredLinks.tsx';

<StructuredLinks
    demoLink="https://revisit.dev/study/demo-vega/"
    codeLink="https://github.com/revisit-studies/study/tree/main/public/demo-vega"
    referenceLinks={
      [
        {name: "Vega", url:"https://vega.github.io/vega/"},
        {name: "Vega-Lite", url: "https://vega.github.io/vega-lite/"},
        {name: "Vega Config Component", url: "../../typedoc/interfaces/VegaComponentConfig/"},
        {name: "Vega Path Component", url: "../../typedoc/interfaces/VegaComponentPath/"}
      ]
    }
/>

This will render like this:

Are there any additional TODOs before this PR is ready to go?

TODOs:

• Add how-to-use instructions somewhere in comments of website
• Update any existing tutorials with the new structured links (especially examples)
• Fix building issue